Saves the document pages as images in PNG format, one page per output file. The fileName parameter is used as a .NET format string, with current page number (1-based) passed to it as the value to be formatted. Note that if fileName does not contain a format item (such as "{0}"), all pages will be saved into the same file name, the last page overwriting everything else.

public void SaveAsPng( 
   string fileName,
   GrapeCity.Documents.Common.OutputRange pageRange,
   GrapeCity.Documents.Pdf.SaveAsImageOptions options
)